The bug provides potential for man in the middle (mitm) attack for those using public WiFi and other untrusted / unsecured networks. The problem was introduced in 10.9.0. Other versions of OS X such as 10.6.8, 10.7.5, 10.8.5 are not affected, ObamaPacman confirmed.

To update, go to Apple Menu and click “Software Update.” After the download, the update requires a restart and few minutes for installation.

OS X Mavericks 10.9.2 Combo Update Download

Those with an office full of Macs might want to download the OS X Mavericks 10.9.2 Combo Updater (820MB download) once and distribute it internally. The Mavericks Combo Updater will update any computer running Mavericks version 10.9.0 and 10.9.1.